Drilling unit



A. F. REHNBERG March 11, 1941.

' DRILLING UNIT 2 sheets-sheet 1 Filed Aug, 17, 193s kum.

Pacman. 11, 1941 r p iiciency.` Y v- -A salient feature of the'V drilling unit oi my in- @ventionis thel concentric'arrangeinent with the'i Vdrill ,spindle pi, the means`jor j zand yspring means for impartingt e feed and returnv movements tothe,sioiridlefA wherebyto'j secure not only c omp1 1 ctne ss,. 4 but also .'fi'eedomfrom Y vibration end ,at the sarnsiziirie' make for easier operation by having y closely as possible tothe axisy of `the"dri1l' `spindle.

- Still another importantfeature `of2 the 'invenf Y tion isthe provision of yadrillirigunit 'J`f t'. he :kind fr mentioned having pick-'oigears 'which'ifmay be changed readily to suit different requirements .when a ydierent cammeans isv substitutedior a new set-up ofthe unit, andalso; having rtine-'head equipped with a rotatalilyll adj u'stable`fiace f plate arranged to turn a lrelation to the axes of the drive or amature shafts()v Aerm lspindle mdf-the be adjustedacloser toget er or` vfartheapart; ac' cordingly .as the particular I may necessitate. l

- The invention is illustrated in the accompany I U ing drawings, in whichaccordance with 1 ingunit made. in

Fig. 1 isla longitudinal section tn rougndnu; my invention;

application-Annet 17,1938,

' (fol. 'i1-6) sleeve Il I 334,451 i f r s LDRILHNGUNHI l @Axel =F. Rehnberg, Rockford, f berg-JacobsonlMi'g. Co.,

corporationo! I liin'ois' Y carries Ahall IIL, assigner-'to Rebn-jr v "sensi m1225405 f Y l siteendsV thereof foranti-*friction*V support ,oilthe with the inner bearing|2l to the drill spindle assembly Feed movement is imparted tothe-.;drill=.spindle .1" i bya hollow lcylindrical camnl, and theispindie` f s the thrust'transmitted as a i returned-by a. coiled'compresf is adapted to be' drill'` spindle 1,l one,A lof abutment with .an l annular outer end oi "the spindle f ,1,1 andaspacing l. sleeve and the inner bearing these bearings having shouldenK Iii` v'mear' th'e "I4 beinginter'posed betweenthe 4n niterhearing l Beanies" filoni-tesina alongl withga ng :liwhich' l t' nclot the A cenar ls eenthe inne at, l1, and secured 'against'endwisefdisplacement 'on` the innery end of sion spring 20,7both s concentrici' relation with the spindles: '61 and" g1,

that theseaxes may tary st'ionalviw' sinner 1, but4 showing a modied Fig. 41isxallong'itudinal. section 'throughi still* v'another d rniingmiit of further meeinee'fcony struction with a port'on of motor broken f the;A unit shown in Fig.r 4;

i A Similar reference Referring first to l'form of unit at spindle and l'isthe hollow d rili' in telescopingjrelation 'with'theo A of, and havingv driveY transmitted the longitudinal slots l arr isolated :vi'ev-f"of for numerals'iare applidto cori as shown. Movement from the spindle by means of :a ntglvthreaded thefspindlehas-5,abutmenty keep the rparts of assembledyrelation.

of -.these being .disposed iny tions through the niediumof fthe 'bearingifsleeve .--il l; the carni I9 jbeing f ltive end thrust tothe arrange'dytof transmit posi; sleeved i through, the inner --ranged totransmit f the -outergend 'ofthe'sleeveii slidingu l serveer-to .ahold the, lsleeve v .v

tubular housing 2 8 against vturning-,wh movement with the shownV with the" peak of 'theiproled -ing -a drill in place the @and the =f`spring 20; being c yi' ldinsfendifthrust'toithe sleeve II in the? opposite direction'by abutment 'pick-off I gears :usedl witli' the: ring -I 5- whichengages lthe in'ner-Ehearin:g

' l2"on1thelopposlte,sideffromf-thetoollar! B'.- .iA

collar23 surrounding diametricallyopposed:holes 24;-thereirrfxeceivirigV Y. the v'ends of the cross-pini! 8,`

= flange 25 on this collarprovides -a the r spring 3,2!!.2

f springv 20 fully compresse to retractedv posi vThe housing which encloses theldri "and associated mechanism lY t, l' iectsfroma face p1a'te 3 3| of the, drilling vunit. '.f :Tliisheadl servesto enclose the Vtweenrtheelectric drive motor 3L-Midl previously-described while?4 5.5. j

is impartedinkom einserl ile; permitting reciprocatory rin' the 'spindle 1.

intermediari?.

The latteris 40 g sleeveilk at,the' }zouterlimit of. its movement witlrfthe.rol1er;22disposedat the L carni' surface 2 lfy and with the jy df. andreajdy toyreturn tion-,1` sogas tojwitn- ,45j

Y draw the-f drillifrom '.f ath'e work 'with the .drillv j,

'to i With the speen of the drm sp'mme 1b in Qrder that'the latter will be given'feed and return movements similarly as in the units above described. The

Vcam I9b is shown as madef up of two sections 62a rand 63a. joined together oyfa sleev'e 64a providing therebetween an endless track orv slot 'Gla' for the followerroller 22h. The 'drill spindle 1b is driven as follows: The motor 32h has its armature shaft 34o drivingA a. gear 35bmeshed with a gear 31h carried on acounter-shaft 68 parallel armature shaft 34D. Another gear 69 on the counter-shaft 68 meshes with a gear 10 on the driven spindle 6b, which, as prevlouslyupointported on a cross-shaft 14. VThisconstitutes'one ed out, drivesthe spllnedv end 65 of the drill spindle 1b. The cam ISbis driven asfollows: A worm 1l on'the counter-shaft 68 meshes with a worm wheel 12 on the sleeve 1 3 rotatably supstep of reduction, and a further step of reduction cam and follower both rotating.` Then, too, the.4

present construction is designed with a view to f Y 1 betweenthe driving shaftan'dfthe drill spindle have been drawn with legitimate modifications and adaptations.

.means comprising a drive shaft having adirectspindle, Asaid o slot provided therein intermediate the ends thereis secured by a.. second wormgear` 16 suitably fixed to and turning ,with one section 62a of the cam 19h. lIfhe `operation of a unit constructed along theselines is substantially the same as the operationof .the other units, exceptVas vpreviously pointed out, in regard to theV rotation of the cam I9b alone, instead of the permitting an easierf change .in the gear ratio and its operating cam, the present design perin ittingfeasy change ofthe pick-off gears 35h and 31h. Y

It isbelieved the foregoing description conveys'y a good understanding of tages of my invention.

the objects and .advan- The appended'f claims a view to covering all I claim: Y* Y 1'. In combination, a driven spindle adapted to drive a drill or other tool, means for 'supporting saidspindle for rotation and reciprocation.

'driving connection with thespindlefor rotating the spindle at a substantially .constant speed, said d direct driving connection consisting-of a gear' fixed on the shaft in direct mesh with ay gear" fixed on the spindle, and means for vreciprocating said spindle in feed Vand return movements in" v cluding a cylindrical end thrust camvin concentric relation with and closely surrounding the cam having an internal endless cam of, a follower turningwiththespindle'close to the axis thereof and projecting into said slot for Y vpositive actuation of the spindle in its reciprocatory movement during rotation, vand means con sisting of a gear fixed on the cam-meshing directlyfwith a gear fixed on the drive shaft for'drivil'ig-` said cam at a substantially constantspeed bearing a predetermined differential relationship to the speed of the spindle.

jecting therefrom and adapted to carrya drill, a bearing sleeve slidable in the casing and having anti-friction bearings therein supporting said y "15 turning with' Y the worm Lwheel .12 and meshing v,with a worm' spindle for rotation, meansforfrotating the spindle at a.k substantially "con'stant'speed, including a driven spindle in telescoping. driving relation with the drill spindle, and means j for reciprocating said drill-spindle in feed 'andreturn movements,

includinga coiled-.compression spring inside saidsleeve'in concentricv relation with said spindles rand disposed-on .one ,sidel of oneof said antilfrictionfsleeve bearings andul'iavingv lts'on'ef `end supported against endwisemovement by-the driven spindle and its otherv end vmovable and arranged to transmitmovement through :the adjacent anti-'friction Y sleeve, bearing to `the Asleeve .so as to move saldgiriu spindle yleldingly 1n one direction, a cam` follower carried on said drill spindle outside said sleeveand. ldisposed. within the'casing on the opposite'fslde of theaforesaid `anti-friction sleeve bearing to' transmit positive movementto said sleeve and. drill spindlein the opposite direction, a cylindrical j end thrust cam abutting. said follower and disposed in concentric relation with the drivenspindlejwithin the casing, and means for driving saidcam at a substantially constant speed bearing a predeter- 'mined' differential relationship lto the' speed of` thedrill spindle. f. n i

y 3. Inv a driiling-unit'th combination of ahollow head adapted -toV be mounted `onta.' support yand adapted to support a', drive motor on one side thereof and a drill spindle projecting from the other sidethereof, a drive motor mounted onone side ofvsaid head,'a .'tubularhousing for a drill spindle-mounted on and projecting from the other side of said head, a drill ,spindle in said housing extending lengthwise thereof into the head, bearing means the-outer end'of said housing supporting the spindle for'rotation and reciprocation,a hollow cylindrical cam surrounding saidV spindle in thexrinner end of said housing and havingv a reduced hollow cylindrical portion bearing on the inner vendl of said.' spindle and,

f projecting into said jhead, bearing means inthe innerV end lof f said housing supporting the reduced portion of said cam for rotation and against endwise movement, said cam having an endless Y cam .slot provided therein intermediate thefends thereof, a radially projecting follower on the spindle slidably engagingin said slot, the aforesaid motor comprising an armature shaft ex- -ten'ding through said head in parallel relation to.

the inner end of said spindle, two different gears flxedon the end of` said armature shaft lin said head, and two other differentv gears in said head meshing with thevlast named gearspne'being fixed on the inner end of thereduced portion of said cam andthe other having a sliding driving connection with the inner endiof thespindle.

-, 4;. In a drilling unit the combination of a hollow head adapted to be mounted on a support and: adapted to support a' drive motor on one side thereof and a drill spindle lprojecting from the other side thereof,.a drive motor mounted on one side of said head, .a tubular-housing for a drill spindle mounted on and projecting from Athe other-side of said head, a driven spindle and a drill spindle having a telescoping .driving con nection with one another and disposed in said housing with the `drill spindle extending from the outer end lof said housing and the driven' spindleprojecting from the. inner end of said n ".housin'g 'into said head, bearingmeansi'n the 2. In combination, a casing, a drill spindle proouter end of 'said housing supporting the drill spindle forv rotation and reciprocation, a hollow cylindricalcam surrounding said driven spindle in the inner end of said housing and having a 4 n assignerk reduced hollowlcylindrical portion bearing on saidspindle andprojecting intothehead, bearingv means intheinner endjof said housingfsupporting said cam byits reduced portion forrotationiand against endwisefinovement, said cam having ,an endless foam track providedfthereon, a radially projecting follower on the drill spindle slidably engaging saidv track, the aforesaidmotor comprising an armature shaft extending into said h ead in parallelrelatlorih to that/inner endg o f said drive'n` splndle,-twoy diierentgears fixed on the end vof ysaid armature shaft 'in saidhead,

and twovotherA differenty gears in saidhead meshing with the last namedfgears, one being fixed on the inner en d'ofthe reduced portion of. said cam and theother beingVflXed-on the inner Aend of thedrivenspindlexA Vf 1! 'f 'i 5. A drilling unit -as set forth in claimwhere- Y in the housing includes a faceplate on the inner end thereof rotatably adjustable on and detach- Aable from said head, the `rotatable adiustment beingabout a center in eccentric relation to the centers of thearrnature'shafty and 'cam driven therefrom. ,Y f

5,6. A drilling unit as set forth in Aclaim 4 wheredrill, abearing sleevefslidable in thev outer `end of said casing aridl having anti-friction 'bearings therein supporting'said spindle for. rotation,` an electric 'motorfor driving'the spindler at a substantially` constant speedcomprising-an armature shaft in parallel relation to thespindle, a, gear on said armature shaft meshingl directly..4 `with` a gear onthe spindle to 'drive the same,`

"and meant forreciprocating said spindle'in feed .and return movementsincludinga hollow cylind'rical' cam surrounding said spindle andlhaving a reduced'hollow cylindrical portionssupported in 'anti-friction bearings in the inner endof the `A`f rotatable relative to one another about a common casing, another gear on said'armature shaft different from the first gear meshing with a gearA on said reduced'hollow cylindrical bearingportion, whereby y'said cam'lsdriven .in the same direction-but in'edifl'erential relation to the spinldle, saidcam having a cam rtrack-provided thereon,A and a radially projecting follower on the. spindle slidably engaging said track;

8. A drillingunit comprising; in. combinatiom an electric motor having'an armatureshaft withVV two diierent' gears fixed thereon,1a drill-driving spindle disposed in close` parallelrelatlonwith the armature shaft having agent Splined thereon meshing with one of` they. armatur'efshaft gears. f or a direct drivingconnectionwiththe motor,` another gear meshingv with theotherarmaturef shaft gear in concentric relationiwith the .drill spindle' gear, and relatively "rotatablecainjjaridl follower lmeans. one lrelatively; rotatable-'portion of whichiurns with 'the drill spindle 'andj the other v'relatively rotatable portion of which turns `with thelast mentionedv gear in diffe ential relav tion ywithv the first namedI portion* 'with' the armature shaft having a gear splined l`rthereon Iwithout; of the armature shaft gears for fa direct drivingv connection with the motor, anelongalted housing rigid `withfthe'hous- .ing of said electric motor, a bearing fsleeve slidable in said housingfsupporting thedrill'spindie for rotatioand 'freciprocation, anotherr gear n :or'icentric` relation" with Vthev drill 'spindle i gear,

a hollow cylindrical'jcani in 'concentric relation Awith`-thejdrill spindle Vdriven by 'the'last named the saniedirectionf'fbut in `differential gearfinfrelatio Twithfthedrill spindle, said cam having ari.endless,cain'j ntrack',V and a follower turn.-

r ing with theldrill spindleandfengaging said track wherebyfthejgdrlll'spindle is positivelyfed in one direction'and positivelyreturnedin the eontinu. v

1 o.A drilling unitfoomprising, m combination van "electric vrr'ioto havin'g'an armature shaft carrying two different gears, a pair of other gears rotatable relative toene-another about a commonA`lv centerfmeshing with the first named gearslth'e. last named' pair offgears beingy of a diameter in relationto the first named gears tolle substantially wholly within the diameter ofthe motor, housing v"means rigid-with the motor en.;;

closingsaidgears and including a hollow cylindricalfextensionin coaxial 'relation with the.

second named pair of gears, lal drill spindle proend of k said-'extension and having anti-friction `jbg'earixigs"thereinsupporting said spindle forro- Ytation", saidispin'dle having means connectedwith one of vth'esecond namedpair of gears whereby l--tho spindle is driven, affhouow oyundrioai cam received in bearings providedtherefor in the in ner'end of saidhousing vextension and carrying the other of thefsecond named pair of gears, and a cam follower engaging a track^proyided on the cam and turning with the spindle.`

11.*A-dri111ng vunit` comprising, in. ycombination, an electric rn'otor having an armature shaft carrying two'different gears, a pair of ,other gears center meshing "with the first named gears, the

' last named pair of gears being of a diameter in relation to the rst'nam'ed gears to lie substantially Wholly within the diameter of the motor, housing" means rigid with the motor enclosing said gears 'and including a hollow cylindrical extension in coaxial relation with the sec- 4bearings therein supportizfrgfsaid spindle for rot atio`n, Isaid spindle haizingshaft means connected withoneotthe second named pair of 'gears for `driving-the spindle, a hollow cylindrical cam sur- :rounding the last `named shaft having a reduced hollow extension for positioning said last named shaftyieoncentric relation with the housing ex- .t'ensiong said "reduced hollow extension being vfixed tofthe othervof the second named pair of gearsbeari'ngrneans supporting said reduced hollowext'ension inA concentric. relation With the A. y housing extensiomanda cam follower engaging a` 19. A Vdrilling unit comprising', Vinv combination, i an electric-motor having an armature shaft `with `two different gearsfixedigthereorhja` drill driv-`y 4ing spindle disposed in closelparallel relation carn track-on said cam and turning with the drill spindle. f i Y l 'f i' AXEL F;,REHNBERG.

" rooting fromsoid oxtensionfond adapted to carry .a drillfabea'ring' sleeve slidable in the outer 

